I have a 1.83 Core Duo Macbook thats probably over a old, not sure the exact date I got it. But it has a crack on the bottom case on the edge a small strip is cracking off. I honestly don't care to much about it cause this is the best computer i've owned so far. But anyway it did take a year before it happened and has been used quite a bit. I love my Macbook, probably get another one when its time to retire this one. 🙂